"We are cooperating fully with the police investigation. It was mentioned yesterday that deliveries may have come to his work. That is being looked into," university spokeswoman Jacque Montgomery said.
The shooting began shortly after midnight Friday, at a soldout showing of "The Dark Knight Rises." Law enforcement officials tell ABC News that Holmes purchased a ticket, entered the theater and left through an emergency exit shortly after the movie started. He geared up with body armor and guns and returned to the theater.
Dressed in full riot gear, Holmes allegedly re-entered from an emergency exit in the front right corner of the theater before releasing something that witnesses identify as tear gas or a smoke bomb.
One theory from law enforcement officials is that Holmes began shooting with his Remington shotgun, which may have been loaded with a type of bird shot.
When he emptied that, he then likely switched to his Smith and Wesson .223 with a drum magazine holding as many as 100 rounds, law enforcement officials said. The rounds from this rifle are the ones which are believed to have penetrated the walls of the theater.
When this assault rifle jammed, officials believe Holmes transitioned to his next firearm, a Glock .40 calibre with an extended clip with a 40-round capacity. Several of these clips were recovered in the theater.
The first three firearms were recovered in the theater. The fourth gun was found in his car after he was confronted by police.
Holmes, 24, is currently in custody at Arapahoe County Jail.
Some recently released inmates from the jail said Holmes is not likely to get a warm welcome from the other prisoners.
"They're paying really close attention to keeping him separate," Steven Phillips, who was recently released from there, told ABC News. "He's in red, he's in chains, his arms are chained up in like a jacket. When he came in, they said he had a bullet proof vest on over his clothes so somebody wouldn't stab him."
Phillips heard that Holmes is being kept in 23-hour lockdown, one of the most protected types of confinement. He is given one hour outside his cell per day to shower and use the phone.
Jacob Wesson, also recently released from Arapahoe County Jail, said that because Holmes is a murder who killed children, if he was kept with other inmates, they would hurt him. "He wouldn't last," Wesson said.
Inside James Holmes' Apartment
New pictures emerged overnight of several explosions in a Colorado field where investigators took chemical materials recovered from Holmes' apartment.
Crews reportedly transported the materials by dump truck to the field so that they could be ignited -- and determined if they were in fact explosives.
Federal authorities and local police have now pulled all of the potential explosives from Holmes' apartment after gaining entry and eliminating potentially explosive traps Saturday.
The 800-square-foot apartment contained several trip wires rigged to trigger explosions, police said.
Scattered throughout the living room were 30 explosive devices -- including jars with chemicals and 30 shells with explosive powder -- similar to large fireworks, police said.
Bomb squads carefully neutralized the two main threats at the entrance of his apartment using a "water shot" and remote-controlled robot.
Oates said the suspect's intentions were clear.
"What we're seeing here is some evidence of calculation and deliberation," Oates said.